JPS58198650A - Loop type heat pipe system solar heat water heater - Google Patents

Abstract

PURPOSE:To improve heat collecting performance by a method wherein a pipe at the outlet side of an evaporating part and the pipe at the inlet side of a condensing part are communicated while the inlet side pipe of the former is communicated with the outlet side pipe of the latter when the loop of the loop type heat pipe is constituted. CONSTITUTION:In the loop type heat pipe 4, provided with a solar heat collector 1, a heat exchange tank 6, the evaporating part 5 and the condensing part 7 provided in the tank 6, the outlet side pipe 5a of the evaporating part is communicated with the inlet side pipe 7b of the condensing part through a gas and liquid separator 8. The inlet side pipe 5b of the evaporating part is communicated with the outlet side pipe 7a of the condensing part through a return pipe 9 to constitute the heat pipe 3 into the loop configuration. The separator 8 is constituted by a pipe larger than the same of the outlet pipe 5a of the evaporating part while the entrance and the exit of the separator 8 are arranged so as not to oppose to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loop heat pipe type solar water heater having a loop heat pipe.

The conventional solar water heater for this building was constructed as shown in Figure 3. That is, 11 is a solar heat collector installed at an angle, and this solar heat collector 11 has a light transmitting body 1 on the front side.
2, and a heat insulating material 13 and an evaporation section 16 of a loop heat pipe 14 are provided inside. Reference numeral 16 denotes a heat exchange tank installed above the solar heat collector 11, and the condensing section 17 of the loop heat pipe 14 is disposed inside this heat exchange tank 3. The loop heat pipe 14 connects the outlet side pipe 15a of the evaporation section 15 and the inlet side pipe 17a of the condensation section 17, and also connects the outlet side pipe 15a of the evaporation section 15 with the inlet side pipe 17a of the condensation section 17.
and the outlet side pipe 17b of the condensing section 17 are communicated with each other to form an annular configuration.

However, in the above conventional configuration, the evaporation section 16
When the temperature of the solar heat collector 11 rises and the amount of evaporation of the working fluid increases because the diameter of the pipes that make up the solar collector 11 is small or the amount per pipe is large, the steam bubbles generated will affect the action of the bubble pump. Then, the liquid phase metal is lifted up and the working fluid flows into the condensing section 17 through the outlet pipe 15a of the evaporating section 15 and the inlet pipe 17a of the condensing section 17, thereby greatly increasing the condensing heat transfer coefficient. Let's lower it. As a result, the amount of condensation of the vapor of the working fluid decreases and the pressure does not become low, so the evaporation of the working fluid in the evaporator 15 is also suppressed. This has the disadvantage that energy cannot be effectively transferred to the 16 parts of the heat exchange tank, and as a result, the heat collection performance of the solar water heater is reduced.

In view of the above conventional drawbacks, the present invention improves the heat collection performance of solar water heaters by ensuring heat transfer to the heat exchange tank even when the amount of solar radiation is large, without increasing the diameter of the pipe in the evaporator section. The purpose is to improve

The basic configuration of the present invention to achieve the above object is to configure a loop heat pipe in an annular shape, with an evaporating section disposed within a solar heat collector and a condensing section disposed within a heat exchange tank. In this case, the outlet side pipe of the evaporating section and the inlet side pipe of the condensing section are communicated with each other by using a gas-liquid separator valve, and the artificial side pipe of the evaporating section and the outlet side pipe of the condensing section are connected to each other. It is constructed in an annular shape by connecting pipes with valves.

By having the above-mentioned structure of the present invention, when the diameter of the pipe at the base part is not large or when the amount of solar radiation is large, the amount of evaporation of the working fluid in the evaporation part increases, and bubbles with high electric current are generated. The group performs the action of a bubble pump to lift the liquid phase of the working liquid and rise, passing through the outlet vibrator of the evaporation section and reaching the gas-liquid separator.The gas-liquid separator separates the gas and liquid phases. The gas phase further advances, exits the gas-liquid separator, reaches the condensation section, and is condensed and liquefied. Therefore, the liquid phase does not flow into the condensation section and cause a decrease in the heat transfer coefficient of the condensation section, and the evaporation section Since it is possible to prevent the evaporation rate from decreasing in the heat exchange tank, it is possible to ensure the transfer of commercial heat to the heat exchange tank, and as a result, the heat collection performance of the solar water heater is improved.
It has the excellent feature of being able to

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

In Fig. 1, reference numeral 1 denotes a solar heat collector installed at an angle, and this solar heat collector 1 has a light transmitting body 2 arranged on the front side.
Moreover, a heat insulating material 3 and an evaporation section 6 of a loop-type heat pipe 4 are arranged inside. 61/'i A heat exchange tank installed above the solar heat collector 1, in which the condensing section 7 of the loop heat pipe 4 is disposed. An outlet side vibro a is connected to one end of the evaporation section 6, and an inlet side pipe 5b is connected to the other end.
are installed in succession. 1. An inlet pipe 7a is connected to one end of the condensing section 7, and an outlet pipe 7b is connected to the other end.
are installed in succession. The outlet side vibro a of the evaporating section 5 and the inlet side pigua a of the condensing section 7 are connected through a gas-liquid separator 8, and the inlet side pipe 5 of the evaporating section 6
b and the outlet side pipe 7b of the condensing section 7 are the return pipe 9
It is configured in an annular shape by communicating through the. Note that the return pipe 9 may be configured to be housed within the solar heat collector 1.

The operation in the above configuration will be explained. The sun yf: passes through the light transmitting body 2 disposed in front of the solar heat collector 1 and is absorbed by the evaporator 5 of the loop heat pipe 4. The light absorbed by the evaporator 6 is converted into thermal energy, and the heat evaporates the working fluid sealed in the evaporator 5, and this vapor rises to reach the condenser 7, where it is cooled. The condensed latent heat is given to the heat medium 10 in the heat exchange tank 6 to raise the temperature of the heat medium 10 (i7).Then, the liquefied working fluid is evaporated in the solar heat collector 1 via the return pipe 9. The liquid then returns to the evaporating section 6, where it is evaporated again in the evaporating section 5, and the above-described operation is repeated.

During the above operation, when the pipe diameter of the evaporator 6 is not large or when the amount of solar radiation is large, the working fluid in the evaporator 6 is lifted by the pump action of the steam bubbles and rises in the gas-liquid separator 8 housing. The vapor and the working fluid are separated by the gas-liquid separator 8, and only the vapor is sent to the condensing section 7 to effectively transfer condensation heat, thereby ensuring high heat transfer performance.

FIG. 2 shows an enlarged cross-sectional view of the gas-liquid separator 8. The gas-liquid separator 8 is composed of a thick pipe whose inner diameter is sufficiently larger than the diameter of the vibro a on the outlet side of the evaporation section 6, and which allows the gas-liquid separator 8 to The inlet 8a and outlet 8b of the separator 8 are configured not to face each other. With this configuration, the gas-liquid two-phase flow that has risen in the narrow outlet side vibro a of the evaporator 5 due to the pumping action of air bubbles enters the gas-liquid separator 8 made of a thick pipe. Since the pumping action is lost, only the vapor leaves the liquid phase, exits from the outlet 8b of the gas-liquid separator 8, and reaches the condensation section 7. Furthermore, even if the amount of vapor in the evaporator 6 is very large and a high-speed gas-liquid two-phase flow jumps into the gas-liquid separator 8, the gas-liquid two-phase flow will flow onto the wall located opposite the inlet 8a. After colliding and falling, only the vapor will exit from the outlet 8b opened on the surface, and the liquid phase will pass through the gas-liquid separator 8.
remain within.

As described above, according to the present invention, when the loop heat pipe is configured in an annular shape, l:1. + 11111
! It has an annular configuration in which the I pipe and the inlet pipe of the condensing section are communicated via a gas-liquid separator, and the artificial side pipe of the evaporating section and the outlet pipe of the condensing section are communicated via a return pipe. The function of the gas-liquid separator prevents the working fluid from flowing into the condensing section, so the heat transfer coefficient of the condensing section does not decrease due to the liquid phase flowing into the condensing section, resulting in high heat transfer performance. As a result, the heat collection performance of the solar collector can be improved.
F is measured. 1. This allows the diameter of the pipe in the evaporation section to be made smaller, which reduces material costs, and also reduces the flow of hydraulic fluid, which reduces costs accordingly. It is something.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a loop heat pipe type solar water heater showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of a gas-liquid separator in the same water heater, and Fig. 3 is a similar sectional view showing a conventional example. It is a longitudinal cross-sectional view of a water heater. 1... Solar heat collector, 4... Loop type heat pipe, 6... Evaporation section, 5a...
- Evaporation section outlet side pipe, 6b...Evaporation section inlet pipe, 6...Heat exchange tank, 7...
・Condensation section, 7a...Inlet side pipe of condensation section, 7
b... Outlet side pipe of condensing section, 8...
Gas-liquid separator, 9...Return pipe. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (2)

[Claims] (1) A solar heat collector, a heat exchange tank installed above the solar heat collector, an evaporation section disposed within the solar heat collector, and a condensation section within the total heat exchange tank. a loop-type heat pipe disposed in the evaporator section, the loop-type heat pipe communicates the outlet side pipe of the evaporation section with the inlet side pipe of the condensation section via a gas-liquid separator, and A loop heat pipe type solar water heater configured in a ring shape by connecting the pipe and the outlet side pipe of the condensing section through a return pipe. (2) The gas-liquid separator is configured with a pipe that is thicker than the outlet side pipe of the evaporation section, and the inlet and outlet of the gas-liquid separator are configured so as not to face each other.
Loop-type heat pipe type solar water heater as described in .